This error typically occurs when using the calcOpticalFlowPyrLK function in OpenCV and indicates that there is an issue with the input points matrix. Specifically, it means that the number of points in the previous points matrix (prevPtsMat) is less than or equal to zero.
To fix this error, you should check the inputs to the function and ensure that prevPtsMat contains valid point coordinates. You may also want to verify that the data type of the matrix is correct (i.e., CV_32F). Additionally, make sure that the size of the points matrix matches the expected dimensions for the function.
If you are still having trouble, consider looking at some sample code or consulting the OpenCV documentation for additional guidance on how to use calcOpticalFlowPyrLK effectively.
{
if (currentRow >= 0 && currentRow < imagePaths.size()) {
img->load(imagePaths[currentRow]);
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